The increase in size definitely serves Carnival -- increases profit margins -- but does not improve the shipboard experience for passengers. It seems that Carnival increased the passenger count disproportionately to the size of the ship's spaces and the crew:passenger ratio.
The Conquest/Triumph-class ships are maintained beautifully. I didn't see much difference between those and the new Magic.
It's overpopulated.
11244 - Spa Deck
Very small. Not much larger than the lowest inside cabin. I was disappointed.